<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="lib/react.development.js"></script>
    <script src="lib/react-dom.development.js"></script>
    <script src="lib/babel.min.js"></script>
</head>
<body>
    <div id="root"></div>

    <script type="text/babel">
        const root =  ReactDOM.createRoot(document.getElementById("root"));

        class App extends React.Component {
            render() {
                return (
                    <Child userName={"zhangsan"} age={15}></Child>
                )
            }
        }
        class Child extends React.Component {
            render(){
                return (
                    <div>
                        <p>userName:{this.props.userName}</p>
                        <p>age:{this.props.age}</p>
                    </div>
                )
            }
        }
        root.render((
            <App></App>
        ))
    </script>
</body>
</html>